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Impact of drought on WASH systems

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Uncertainty with climate change is a big factor in accurately planning and preparing for WASH resilience. But planning only on changes in rainfall would be too simplistic, as water ''availability'' is not solely affected by climate change – population growth and changing water demand also contribute. Supply-side strategies (water volumes and availabilities) therefore need to be planned together with demand-side strategies (population growth, projected increases in demand). Lastly, greater rainfall intensity events may require some structures to be reduced (e.g. embankments, bunds) rather than increased.

===Definitions of drought===

[[Image:ClimateChangeDiagram.jpg|thumb|right|250px| Four Approaches to Drought. National Drought Mitigation Center (NDMC), University of Nebraska-Lincoln, USA.]]

[[Image:DroughtMap.jpg|thumb|right|250px|Regions of drought recorded between 1979 and 2008, where drought events are identified as three consecutive months with less than 50% of rainfall as compared with the average.]]

===Drought links===

====Climate change====

# Roscoe Moss Company (1990) [http://books.google.co.uk Handbook of ground water development.] John Wiley & Sons, USA. How to deepen existing boreholes.

===Acknowledgements===

* CARE Nederland, ''Desk Study Resilient WASH systems in drought prone areas.'' October 2010.

Winona

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